*Note: Operation under no load will not damage these devices, however they may not meet all specifications. A minimum load of 6mA is recommended
I-8
REV: 2/2016
www.recom-power.com
INNOLINE
DC/DC-Converter
Characteristics
R-78AAxx-0.5 SMD
Series
Ripple
Vo=12V,15 V
Vo=9V
Vo=5V
Vo=3.3V
Vo=1.8V
Vo=1.5V
50
Vo=15V
Vo=12V
Vo=9V
Vo=5V
Vo=3.3V
Vo=1.8V
Vo=1.5V
Vin (V)
10
20
30 34
Efficiency
100
50
25
Efficiency (%)
Vin (V)
10
20
30 34
Ripple (mV)
Efficiency Vs
Vin (Full Load)
Ripple Vs
Vin (full load)
100
Vo=15V
Vo=12V
Vo=5V
Vo=3.3V
Vo=1.8V
Vo=1.5V
50
50
25
Efficiency (%)
Ripple (mV)
Vo=12V
Vo=15V
Vo=9V
Vo=5V
Vo=3.3V
Vo=1.8V
Vo=1.5V
0.1
0.2
0.3
0.4
0.5
0.6
R-78AA-0.5
0.1
0.2
0.3
0.4
0.5
0.6
Output Current ( A )
Efficiency Vs
Load ( Vin=Max )
Output Current ( A )
Ripple Vs
Load ( Vin=24V )
100
Vo=12,15V
Vo=5V
Vo=3.3V
Vo=1.8V
Vo=1.5V
25
20
15
10
Vo=15V
Vo=12V
Vo=1.8V
Vo=3.3, 9V
Vo=5V
Vo=1.5V
50
Efficiency (%)
Ripple (mV)
0.1
0.2
0.3
0.4
0.5
0.6
5
0.1
0.2
0.3
0.4
0.5
0.6
Output Current ( A )
Efficiency Vs
Load ( Vin=Min )
Output Current ( A )
Ripple Vs
Load ( Vin=Min )
www.recom-power.com
REV: 2/2016
I-9
INNOLINE
DC/DC-Converter
Application Examples
R-78AAxx-0.5 SMD
Series
R-78AA12-0.5SMD
220kW
Pgm
Reprogrammable
Flash Memory
Flash Memory Program Voltage Switcher
+Vin
C1
0V
Program
24kW
"Program" = 0V, Pgm Pin = +5V
"Program" = high, Pgm Pin = +12,6V
0V
DC/DC Converter ( 1:1 )
+Vin
R-78AAxx-0.5SMD
+Vout
GND
- High isolation voltage
- Improved loading / line regulation
- Wide Input Voltage Range
- Point-of-Load Architecture
- Remote On/Off Control
On/Off
C1
C2
GND
C1 , C2 : optional
R-78AA-0.5
Optional Protection Circuit
Optional Protection 1:
Add a blocking diode to Vout
if current can flow backwards
into the output, as this can
damage the converter when it
is powered down.
The diode can either be fitted
across the device if the
source is low impedance or
fitted in series with the output
(recommended).
Optional Protection 2:
+Vin
R-78A(A)xx
-xxxSMD
+Vout
+Vin
R-78A(A)xx
-xxxSMD
Diode
Trim output voltage
up 1 diode drop
GND
+Vout
CTRL
CTRL
GND
GND
GND
Application example:
Driving a high capacitive load
+Vin
R-78xx-xx
+Vout
6800µF
GND
GND
I-10
REV: 2/2016
www.recom-power.com
INNOLINE
DC/DC-Converter
Table 1: Adjustment Resistor Values
R-78AAxx-0.5 SMD
Series
R2
21KΩ
21KΩ
10KΩ
10KΩ
10KΩ
10KΩ
10KΩ
R3
5.6KΩ
5.6KΩ
5.6KΩ
10KΩ
10KΩ
22.1KΩ
22.1KΩ
Vref(V)
1.23
1.23
1.23
1.23
1.23
1.23
1.23
1.8V
2.5V
3.3V
5.0V
6.5V
9V
12V
R1
10KΩ
22KΩ
16.9KΩ
30.9KΩ
43KΩ
63.4KΩ
88.7KΩ
+V
in
R1
Controlled IC
R2
GND
R3
+V
o
R
down
Vadj
R
up
GND
Vref
R
2
(R
1
+R
3
) x (V
ref
- V
o
) + V
ref
x R
1
R
3
Trim Down
R
down
=
R
2
V
o
- V
ref
(R
1
+ R
2
)
R
2
R
3
(V
ref
- V
o
) + V
ref
R
1
(R
2
+ R
3
)
Trim up
R
up
=
R
2
(V
o
- V
ref) -
V
ref R
1
R-78AA-0.5
Package Style and Pinning (mm)
SMD 10Pin Package
15.30
15.00
8.80
2.54x4
0.50
Bottom View
9.60
9.40
9.24
12.35
Recommended Footprint Details
10 9 8 7 6
RECOM
R-78AAxx-1.0SMD
xxxx
1 2 3 4 5
Pin Connections
Pin #
1,2
+Vin
3,7,8,9
GND
4,5
+Vout
6
V adj
10
Remote On/Off
xx.x ±0.5mm
xx.xx ±0.25mm
13.00
1.30
10 9 8 7 6
Top View
1 2 3 4 5
1.80
2.54
1.20
The product information and specifications are subject to change without prior notice. RECOM products are not authorized for use in safety-critical applications (such as life support) without RECOM’s explicit
written consent. A safety-critical application is defined as an application where a failure of a RECOM product may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The buyer
shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized use of RECOM products in such safety-critical applications.
1 Introduction
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